its 1922 San Fransisco you're Standing over General Elizabeth of the Imperial German forces as she suffers a peice of rebar stabbed through her lung your fighter plane burns into the top of the unfinished skyscraper as her Mother Ship Zeppelin burns into the surrounding City. You can't help but wonder how it came to this?

1921, the Imperial German Foces invaded America through San Francisco. The Airforce is deployed to destroy their Colosol Robots and Zeppelins